ICS3727XP

www.DataSheet4U.com PRELIMINARY INFORMATION ICS3727XP LOW COST 24 TO 36 MHZ 3.3 VOLT VCXO Description The ICS3727XP combines the functions of a VCXO (Voltage Controlled Crystal Oscillator) and PLL (Phase-Locked Loop) frequency doubler onto a single chip. It is designed primarily for data and clock recovery applications within end products such as set-top box receivers. The ICS3727XP exhibits a moderate VCXO gain of 200 ppm/V typical, when used with a high quality external pullable quartz crystal. The frequency of the on-chip VCXO is adjusted by an external control voltage input into pin VIN. Because VIN is a high impedance input, it can be driven directly from an PWM RC integrator circuit. Frequency output increases with VIN voltage input. The usable range of VIN is 0 to 3.3 V. Features ICS3727XP offers 24 to 36 MHz output frequency range (output frequency = 2x crystal frequency) and improved power supply noise rejection Uses an inexpensive 12 to 18 MHz external crystal Ideal for DV CODEC applications using 27 MHz external pullable crystal with extended pull range to generate locked 27 MHz clock transport video clock On-chip VCXO with guaranteed pull range of ±200 ppm minimum VCXO input tuning voltage 0 to 3.3 V Packaged in 8-pin SOIC (150 mil wide) Block Diagram VIN 12-18 MHz Pullable Crystal X1 X2 Voltage Controlled Crystal Oscillator PLL Frequency Doubler 24-36 MHz (2x Crystal Frequency) MDS 3727XP A I n t e gra te d C i r c u i t S y s t e m s ●...